The aim of this work was to determine the antioxidant activity of some dehydrated fruits from Romanian market (goji berry, chokeberry, apricot, cranberry) and relationship with their content in certain antioxidant compounds: polyphenols, ascorbic acid and carotenoids. Ascorbic acid was determined by iodometric method. Dried goji fruit had the highest concentration of vitamin C (128.70 mg/100g), more than two times higher than the dehydrated chokeberries (61.25 mg/100g). The lowest concentration of ascorbic acid was found in apricots. Determination of carotenoids by the spectrophotometric method showed a very high concentrations of these compounds in goji berries (2597.45 µg/g). Regarding the content of polyphenols, determined by Folin –Ciocâlteu method, the highest concentration was found in the chokeberries (15.83 mg gallic acid/g), followed by the apricots (11.25 mg gallic acid/g) and goji berries (10.62 mg gallic acid/g). The antioxidant activity was determined by the CUPRAC method and the best value was found for the goji berries (185.32 mg Trolox/g), followed by chokeberries (145.37 mg Trolox/g).